Thanks, that guide helped. I still have some confusion over battles. There are times that I am certain I am going to win but then I don't and I am not sure why.
Also, any generic deck building tips, such as stick with 1 or 2 colors? x% creatures, y% items and z% spells?
I have only beat Yuma 1 time in a solo battle (sticking to 2-player battles to not be overwhelmed).